Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics

1. Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle before using the symptom tables.

2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views Locations , Engine Content Specifications Engine Content Specifications , Engine Component Description Engine Component Description , Lubrication Description Description and Operation , Camshaft Position Actuator and Solenoid Valve Description Description and Operation , Cylinder Deactivation (Active Fuel Management) System Description Cylinder Deactivation (Active Fuel Management) System Description and Hybrid Modes of Operation Description Hybrid Modes of Operation Description.

All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start when repairs are necessary. For a detailed explanation, refer to Strategy Based Diagnosis Strategy Based Diagnosis.

Visual/Physical Inspection

* Inspect for aftermarket devices which could affect the operation of the engine. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.

* Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

* Inspect for the correct oil level, proper oil viscosity, and correct filter application.

* Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics.

* Compare the engine sounds, if applicable, to a known good engine and make sure you are not trying to correct a normal condition.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* Base Engine Misfire without Internal Engine Noises Base Engine Misfire without Internal Engine Noises

* Base Engine Misfire with Abnormal Internal Lower Engine Noises Base Engine Misfire with Abnormal Internal Lower Engine Noises

* Base Engine Misfire with Abnormal Valve Train Noise Base Engine Misfire with Abnormal Valve Train Noise

* Base Engine Misfire with Coolant Consumption Base Engine Misfire with Coolant Consumption

* Base Engine Misfire with Excessive Oil Consumption Base Engine Misfire with Excessive Oil Consumption

* Engine Noise on Start-Up, but Only Lasting a Few Seconds Engine Noise on Start-Up, but Only Lasting a Few Seconds

* Upper Engine Noise, Regardless of Engine Speed Upper Engine Noise, Regardless of Engine Speed

* Lower Engine Noise, Regardless of Engine Speed Lower Engine Noise, Regardless of Engine Speed

* Engine Noise Under Load Engine Noise Under Load

* Engine Will Not Crank - Crankshaft Will Not Rotate Engine Will Not Crank - Crankshaft Will Not Rotate

* Coolant in Combustion Chamber Coolant in Combustion Chamber

* Coolant in Engine Oil Coolant in Engine Oil

* Cylinder Deactivation (Active Fuel Management) System Diagnosis Cylinder Deactivation (Active Fuel Management) System Diagnosis

* Engine Compression Test Testing and Inspection

* Cylinder Deactivation (Active Fuel Management) System Compression Test Cylinder Deactivation (Active Fuel Management) System Compression Test

* Cylinder Leakage Test Cylinder Leakage Test

* Oil Consumption Diagnosis Oil Consumption Diagnosis

* Oil Pressure Diagnosis and Testing Oil Pressure Diagnosis and Testing

* Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing

* Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing

* Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing

* Oil Leak Diagnosis Oil Leak Diagnosis

* Crankcase Ventilation System Inspection/Diagnosis Testing and Inspection

* Drive Belt Chirping, Squeal, and Whine Diagnosis Drive Belt Chirping, Squeal, and Whine Diagnosis

* Drive Belt Rumbling and Vibration Diagnosis Drive Belt Rumbling and Vibration Diagnosis

* Drive Belt Falls Off and Excessive Wear Diagnosis Drive Belt Falls Off and Excessive Wear Diagnosis

* Drive Belt Tensioner Diagnosis Testing and Inspection